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SM8136A Datasheet(PDF) 6 Page - Nippon Precision Circuits Inc

No. de pieza SM8136A
Descripción Electrónicos  White LED Driver IC
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Fabricante Electrónico  NPC [Nippon Precision Circuits Inc]
Página de inicio  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8136A Datasheet(HTML) 6 Page - Nippon Precision Circuits Inc

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SM8136A
SEIKO NPC CORPORATION —6
VOUT Output Circuit Mode Switching
The SM8136A output mode switches between 3 operating modes in response to the operating conditions. The
modes are: standby mode,
×1.0 mode (VIN through mode), and ×1.5 mode (1.5-times charge pump boost). The
VOUT output switches automatically between these modes in response to the drive LED characteristics and the
overall power consumption. Switching from
×1.0 mode to ×1.5 mode is controlled automatically by an internal
circuit. The operating mode cannot be specified by an external control signal.
Startup: Internal Reset Time and Soft Start Time
The SM8136A normal startup procedure (after VIN has been applied previously) is to switch from standby
mode to the
×1.0/×1.5 operating modes when the EN enable input goes HIGH. The soft start time (described
on the following page) begins after switching to the operating mode using EN.
(1) VIN is HIGH, EN is LOW (standby mode)
(2) Switches to an operating mode when EN goes HIGH (soft start time begins)
If the use at EN = VIN when power is applied, the startup commences after the power-ON reset (POR) time
(approximately 50
µs) has elapsed.
(1) When using at EN = VIN, rising time from 0.3V to 2.7V should set < 50
µs.
(2) Power-ON reset (POR) circuit resets internal circuits approximately 50
µs after the power is applied.
(3) If EN is HIGH when power is applied, the internal circuits start operating when the internal “CE” signal ris-
ing edge occurs after the power-ON reset time. If EN is LOW when power is applied, the “CE” rising edge
occurs simultaneously with the first rising edge.
Normal startup
Internal reset operation when power is applied (power-ON reset)
Soft start time
VIN
EN
VIN High
ENABLE ON
(1)
(2)
Standby mode
EN = VIN
1.5 mode
Internal
power on
reset
Internal
enable
(CE)
POR time
typ: 50
µs
(2)
(3)
Soft start time
Standby mode
(1)
< 50
µs
0.3V
2.7V


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